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Message: <blockquote data-quote="Agemegos" data-source="post: 2809302" data-attributes="member: 18377">That depends on how much you think about the effects of tides and orbital resonances on  rotational periods. Between tidal kneading of moons in close orbits around their primaries, and extremely long days for moons in more distant orbits (and both for those in orbits in between) it is very hard to specify a realistic habitable moon. Dozens in the one solar system is beyond coincidence.If you want people travelling among scores of inhabited in less than lifetimes you just have to bite the bullet and admit that you are not writing admantine SF. Like you I would prefer that writers posit FTL travel than claim a spurious plausibility for unrealistic celestial mechanics and planetology.What was it that Aristotle said about probable impossibilities and improbable possibilities?</blockquote>